Method to_string

lesson6-Segmentation/json.hpp:11600–11608

! @brief return a string representation of the JSON pointer @invariant For each JSON pointer `ptr`, it holds: @code {.cpp} ptr == json_pointer(ptr.to_string()); @endcode @return a string representation of the JSON pointer @liveexample{The example shows the result of `to_string`.,json_pointer__to_string} @since version 2.0.0 */

    @since version 2.0.0
    */
    std::string to_string() const
    {
        return std::accumulate(reference_tokens.begin(), reference_tokens.end(),
                               std::string{},
                               [](const std::string & a, const std::string & b)
        {
            return a + "/" + escape(b);
        });
    }

    /// @copydoc to_string()
    operator std::string() const